Performance of 26650 Li-ion cells at elevated temperature under simulated PHEV drive cycles

Badami, Pavan; Opitz, A.; Shen, Laifa; Vaidya, Rutvik; Mayyas, Ahmad; Knoop, K.; Razdan, Anshuman; Kannan, Arunachala Mada

doi:10.1016/j.ijhydene.2017.02.004

Cited by 8 publications

(11 citation statements)

References 30 publications

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“…According to the analysis results obtained earlier, the possible enhanced mechanism of NCM622 by EG is as follows: the mixed aqueous solution of (Ni 0.6 Co 0.2 Mn 0.2 )(OH) 2 and LiOH·H 2 O enters and reacts in the interlayer space of EG, which produces a sandwich structure with one graphene layer and one NCM622 layer that prevent the growth of grain by limited effect. During the aggregation process of small particles at high temperatures, some embedded graphene will be oxidized to produce carbon oxides to leave lots of obvious pores on the surface of big particles.…”

Section: Mechanism Analysismentioning

confidence: 92%

“…EG was prepared by heating the expandable graphite precursor for 10 s at 900 C in a muffle furnace. Ni 0.6 Co 0.2 Mn 0.2 (OH) 2 and LiOH·H 2 O (1:1.05molar ratio) were completely mixed by grinding to obtain a mixture that was further added with EG and deionized water to form a uniform mud-like slurry using ultrasonic dispersion. The slurry was transferred to a stainless steel autoclave lined with Teflon.…”

Section: Materials Synthesismentioning

confidence: 99%

“…As one of the interesting power sources for electric vehicles, lithium-ion batteries (LIBs) still face challenges such as stability, rate performance, and safety. [1,2] At the same time, the new energy subsidy policy issued by the government has increased the demand on capacity and safety of power batteries, which makes it vitally important to develop energy materials with good performance. [3][4][5][6][7] As one of the main components of LIBs, the cathode material has a critical impact on the electrochemical properties, safety, and service life of batteries.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Electrochemical Performance of LiNi_0.6Co_0.2Mn_0.2O₂ by Expanded Graphite

et al. 2019

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High‐capacity ternary materials are attractive for the development of electric vehicles for long‐distance driving, but they still face some challenges. To improve the performance, expanded graphite (EG) with a unique loose‐layered structure is mixed with (Ni0.6Co0.2Mn0.2)(OH)2 and LiOH·H2O aqueous solution to supply microscale reaction space and limit grain growth via hydrothermal treatment as well as accommodate LiNi0.6Co0.2Mn0.2O2 (NCM622) particles between the graphene layers. The key factors affecting electrochemical performance are investigated using various techniques. The NCM622 sample synthesized by adding 6.6 wt% of EG (PEG6.6%) exhibits the best performance. EG improves the discharge capacity of NCM622 from 156 to 175 mAh g−1 after 50 cycles at 1 C. As the surrounding temperature increases to 60 °C, the sample also shows good cyclability at 1 C, the 50th discharge specific capacity remains 153 mAh g−1 and the capacity retention rate is 82.3%, which is much higher than that of NCM622. Also, the columbic efficiency of NCM622 after 50 cycles improves from 69% to 99% with EG. The possible enhanced mechanism of NCM622 by EG is discussed. The effective way to enhance the performance using the layered structure of EG is promising for other energy materials.

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Section: Mechanism Analysismentioning

confidence: 92%

Section: Materials Synthesismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced Electrochemical Performance of LiNi_0.6Co_0.2Mn_0.2O₂ by Expanded Graphite

et al. 2019

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“…The detailed procedure to derive current profiles was retrieved, studied, and published by Peterson et al . The CD mode current profile scaled to +/−20 A was directly taken from our previous publication …”

Section: Methodsmentioning

confidence: 99%

“…The semi‐circular arcs in the mid frequency range can be attributed to the SEI layer and the charge transfer resistance ( R 2 ) the electrode‐electrolyte resistance. Also, the tangential line in the EIS spectra at lower frequency is due to the diffusion processes between the electrodes . EIS is a widely used non‐invasive technique used to understand behavior of an electrochemical cell at SoCs and in different environmental conditions.…”

Section: Methodsmentioning

confidence: 99%

Plug‐In Hybrid Vehicle and Second‐Life Applications of Lithium‐Ion Batteries at Elevated Temperature

Vaidya

Selvan

Badami

et al. 2018

Batteries & Supercaps

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In improving fuel economy and reducing carbon footprint, hybrid, plug-in hybrid and all-electric vehicles are considered as sustainable modes of transportation in the automotive industry. Here, commercial Li-ion cells (26650 and 18650 with lithium iron phosphate (LFP) and nickel manganese cobalt (NMC) cathodes) were subjected to simulated plug-in hybrid electric vehicle (PHEV) conditions, using the Federal Urban Driving Schedule (FUDS) under charge-depleting mode at elevated temperature (50 8C and < 10 % RH). The capacity degradation (16 % over 800 cycles) under the PHEV test protocol for Li-ion batteries with 26650 NMC cathodes was twice of that using LFP cathodes (8 % over 800 cycles) under identical conditions. The Li-ion batteries were also subjected to second-life charge-discharge cycling at C/5 rate after evaluating them under the PHEV protocol (800 cycles for 26650 cells and 1200 cycles for 18650 cells). In addition, the high-frequency resistance measured by electrochemical impedance spectroscopy was found to increase significantly with cycling for both the NMC-as well as LFP-based batteries, leading to power fading. XRD analysis of the 18650 LFP-based battery showed change of phase from LiFePO 4 to FePO 4 , indicating Li + -ion loss. However, the cathode active materials of the Li-ion cells (26650 with LFP and NMC cathodes), examined using XRD, showed no significant phase change in the materials after 800 PHEV cycles and around 200 second-life charge-discharge cycles.[a] R.

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Evaluation of accuracy for Bernardi equation in estimating heat generation rate for continuous and pulse-discharge protocols in LFP and NMC based Li-ion batteries

Jindal

Katiyar

Bhattacharya

2022

Applied Thermal Engineering

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Performance of 26650 Li-ion cells at elevated temperature under simulated PHEV drive cycles

Cited by 8 publications

References 30 publications

Enhanced Electrochemical Performance of LiNi_0.6Co_0.2Mn_0.2O₂ by Expanded Graphite

Enhanced Electrochemical Performance of LiNi_0.6Co_0.2Mn_0.2O₂ by Expanded Graphite

Plug‐In Hybrid Vehicle and Second‐Life Applications of Lithium‐Ion Batteries at Elevated Temperature

Evaluation of accuracy for Bernardi equation in estimating heat generation rate for continuous and pulse-discharge protocols in LFP and NMC based Li-ion batteries

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Performance of 26650 Li-ion cells at elevated temperature under simulated PHEV drive cycles

Cited by 8 publications

References 30 publications

Enhanced Electrochemical Performance of LiNi0.6Co0.2Mn0.2O2 by Expanded Graphite

Enhanced Electrochemical Performance of LiNi0.6Co0.2Mn0.2O2 by Expanded Graphite

Plug‐In Hybrid Vehicle and Second‐Life Applications of Lithium‐Ion Batteries at Elevated Temperature

Evaluation of accuracy for Bernardi equation in estimating heat generation rate for continuous and pulse-discharge protocols in LFP and NMC based Li-ion batteries

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Product

Resources

About

Enhanced Electrochemical Performance of LiNi_0.6Co_0.2Mn_0.2O₂ by Expanded Graphite

Enhanced Electrochemical Performance of LiNi_0.6Co_0.2Mn_0.2O₂ by Expanded Graphite